Watch-regulator.



PATENTED .TUNE 26, 1906.

J. BRUN.

WATCH REGULATOR.

APPLIGATION FILED APR.1B,1904.

@5% W @MU WLM/momo PATENT oEEioE.

JOSEPH BRUN, OF CHiAUX-DE-FONDS, SWITZERLAND.

WATCH-REGULATOR.

n No. 824,466.

Specification of Letters Patent.

Patented June 26, 1906.

Application filed April 18, 1904. Serial No. 203,822.

T0 MZ 1071/0111, t may cm1/cern:

Be it known that I, JOSEPH BRUN, a citizen of Switzerland, and a resident of Chaux-de- Fonds, in the canton of Neuchatel, Switzerland, have invented certain new and useful Improvements in Watch-R egulat ors, of which the following is a specification.

The present invention relatesprincipall-y to a deviec for adjusting the stud of a hairspring in a watch-regulator, the object being to provide a rotative member to which the said stud is fixed,A and thus permit the stud to be moved in a circular direction and in a plane at right angles to the axis of the hairspring arbor, so as to adjust and set the outer end of the hair-spring for the purpose of shifting the center of poise of the said spring and equalizing it with the balance-wheel in a comparatively simple and positive manner. This l accomplish by novel means of construction which are illustrated in the accompanying drawings and will hereinafter be fully described and claimed. In the drawings, Figure l is a plan or face view of a portion of a watch-movement embodying features of my invention. Fig. 2 is a sectional detail view thereof, enlarged, showing the balance-bridge and other parts, the view being taken on the line 2 2 of Fig. 1. Fig. 3 is a plan or face view, enlarged, showing a modication of the invention in which a part of the balance-bridge to which the hair-spring stud is attached is rotatable and has means for adjusting the same. Fig. 4 is a sectional detail thereof, the view being taken on the line 4 4 of Fig. 3.

Heretofore usually in adjusting the outer end of a hair-spring the same would sometimes have a portion of the length thereof clipped off before being fixed to the stud. The stud was also attached to a stationary part of the regulator. The result would often be only an approximate adjustment of the point of poise of the hair-spring and would not equalize its position with regard to the balance.

In the present invention the stud, as well as the outer end of the hair-spring, can be adjusted to any desired position or radial an- @le with respect to where the inner end ofthe hair-spring is attached to the arbor, and this is erfectly effected by having a rotatable ba ance-bridge to which the hair-spring stud is attached, the said balance-bridge having its axis on the same center as that of the hairspring arbor. The same object, however,

may be accomplished by having the stud attached to a movable central plate on the balance-bridge.

The following description will at first refer more particularly to the preferred construction of the invention as shown in Figs. 1 and 2. 1 refers, as a whole, to the general frame or body of a watch-movement. 2 is the balance or balance-wheel. This is of any of the usual forms of construction and, as shown, consists of the divided rim 3, having a crossbar 4, to which is attached a collet or collar 5, mounted on the arbor 6. The arbor 6 is mounted in any suitable manner common to watch-regulators. 7 is a movable balancebridge having a bearing 8 for one end of the arbor 6. This bridge is preferably made rotatively as a whole and consists of a cylindrical wall or casing 9, provided with an outer annular flange 10 at its base. The upper part of the bridge comprises radial arms 11, which support a central part 12, in which is the bearing 8. To one of the radial arms 11 is fixed or attached the hair-spring stud 13. 14 is the hair-spring, the inner end of which is attached to the collet or collar 5 and the outer end to the stud 13. The iiange 10 is mounted in a circular recess in the frame or body 1 of the movement. This recess is concentric to the axis of the arbor 6 of the balance or balance-wheel 2 and permits the balance-bridge 7 to be rotated. Screws 15 are inserted in the frame 1 of the movement and have projecting heads 16, which engage the iiange 10. Thus by loosening the said screws 15 the balance-bridge 7 may be readily turned to adjust it, and when placed in a desired position the screws 15 may be turned down until they engage the flange 10 and securely set the balance-bridge in any desired position. The balance-bridge 7 has its center on the same axis as that of the arbor 6 of the balance or balance-wheel, and as one of the arms 11 carries the hair-spring stud 13 it will be perceived that by rotating or moving the balance-bridge 7 the said stud will shift the hair-spring, and thus place its center of poise in any desired position. The balancebridge may be moved a few degrees or in a complete circle, and when the desired position is attained the screws 15 at the base of the balance-bridge may be turned, and thus set and secure the balance-bridge in the said position. The construction as I have now described has also several other advantages such, for instance, as protecting the balance IOO IIO

or balance-wheel, isolating the hair-spring 14, and enabling the same to be readily examined, as also that of the escapement as a whole.

The annular flange 10 at the base of the balance-bridge is not absolutely an essential feature of the invention. By dispensing with this flange 10 and simply havlng the heads 16 of the screws 15 engage the top or rim of the cylindrical wall 9, as shown-in dotted-lines in Fig. 2, the same effect and means of adjustment may be obtained. 17 is the regulator, having a hand18 and formed with an arm 19, carrying the curb-pins 20, between which the hair-s ring 14 is passed.

The improvement I ave described may be modiiiedy to someA extent without departing from the spirit of the invention as shown in Figs. 3 and 4. Thus instead of rotating or moving the whole balance-bridge I may provide a stationary part 21, having an adjustable plate 22, provided with a central movable plate 23, and a centralbearing 24 for the arbor 6 of the hair-spring 14. The movable plate 23 has a circular bearing 25 in the/stationary plate 21 and is provided with a ange 26 beneath the plate, and extending outwardly beyond the plate 22 is a projection 27, which is provided with a clamping device or setscrew 28. The projection 27 from the plate 22 has attached thereto the hair-spring stud 13. The rim of the adjustable plate 22 is provided withy teeth 29. 3() is a pivoted plate fulcrumed to the stationary part 21 by means of a screw-pivot 31 and having bearing-arms- 32 carrying a worm-shaft 33, provided' with a worm 34 for moving the said plate 22. the pivotedplate 30 and bearing against a pin 36 for pressing the worm 34 against the teeth of the plate 22and preventing any displacement of the same. the worm-shaft 33 the adjustable plate 22 may be rotated and the curb-pins 20 adjusted to any desired position. To movey thehair-spring stud 13 intola different position, it is only necessary to loosen the set-screw 28,

yand by means of the projection 27 the plate 35 is a spring-arm extending froml Thus by turning thus be seen that by the means just described it is not necessary to move or rotate the whole of the balance-bridge 7 to adjust the hair-spring stud 13, as it is accomplished by rotating the central part or member 23 with its extension 27.

Having thus described my invention, the following is what I claim as new therein, and desire to secure by Letters Patent:

1. A balance including an arbor and a spring, a stud to which the end of the spring is attached, inclosing means for the balance, said means serving as a bearing forsaid arbor and also'as an adjustable support for said stud.

2. A balance and hair-spring, a stud to which said hair-spring isattached, a rotatable art having its axis central with the axis ofp the arbor of the balance and forming a bearing therefor, the said rotatable part having attached thereto the hair-spring stud, and provided with means whereby the said part may be moved and'set so as to adjust the hair-spring stud.

3. A rotative balance-bridgel constructed with a cylindrical wall, a central part having an arbor bearing and supported upon the wall, and a hair-spring stud.

4. A rotative balance-bridge constructed with a cylindrical wall having a securingflange, a central part having an arbor-bearing, and a hair-spring stud, and supported upon the'wall. i

5.. A rotative balance-bridge constructed with a cylindrical wall having a securingflange, a central part having an arbor-bearing, and a-hair-spring stud, a stationary part having a recess for the flange and means Jfor securing the balance-bridge by its flange'to the stationary part.

JOSEPH BRUN.`

T. REYMOND, ALPHONSE KREIS HURLOGER. 

